During Unit 5, your child will describe and analyze shapes by examining their sides and angles. Students will investigate, describe, and reason about decomposing and combining shapes to make other shapes. Students will partition circles and rectangles into two, three or four equal shares, describing the shares using the words, halves, thirds, and half of. Students will recognize that equal shares of identical wholes need to have the same shape. Students will also work with equal groups of objects to gain foundations for multiplication. They will identify odd and even numbers based on equal groups of two. Students will begin to use number patterns to extend their knowledge of properties of numbers and operations. When skip counting to solve repeated addition problems students begin to build the foundations for understanding multiples and factors.
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Students need to:
- Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces. Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.
- Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape.
- Partition a rectangle into rows and columns of same-size squares and count to find the total number of them.
- Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.
- Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.